What Our Clients Say

Grandhaven LLC has worked with KJN Builders for 20+ years. Jim is the call I make for any and all building issues. Jim and his sons Nick and Jake respond promptly and handle each issue personally. He has proven over and over again that he is a man of his word, a man of integrity, and a man who takes great pride in his work.

We had the pleasure of working with KJN on 2 separate remodeling projects. We were assured a high-quality product at a fair price and that was delivered 100% both times! Jim took our ideas and designed updated spaces that adhered to what we envisioned.

An outstanding carpentry company. Their workmanship is top notch, and they are extremely efficient. KJN Builders are my go-to contractor and have my highest recommendation.

I have been using KJN Builders for buildouts on all my commercial properties for the past 8 years+. They always provide top quality work at a very efficient pace and with a fair price — from challenging medical buildouts to simple modifications.

The team worked through numerous head-winds — supply chain delays and record high inflation — to help us open on-time and on-budget. We're appreciative of Jim and his team!

I was lost when we started talking about remodeling our kitchen. KJN Builders took the burden off our shoulders. Jim and his sons did the work and it was not subcontracted out. We loved their work and would hire them again.

They were on time, professional, courteous and the quality of work was exceptional. Jim kept everyone involved on schedule and checked the work to make sure it was done right. We would and have recommended KJN builders to other people.

This is the second time we have used KJN. KJN took my hand-drawn floor plan and brought it to life on schedule and on budget. Our basement is amazing and the detail from the main level to the basement is seamless. A trust-worthy partner I would highly recommend.

We loved working with Jim & the boys for our basement remodel. They made the 4 hour drive to Crandon and put knotty pine through the basement. The work was flawless and so beautiful. By far the best referral we have ever been given.

Jim Lewein and KJN Builders have successfully built 9 restaurants for our company in the Milwaukee area. They are easy to work with, attentive, and completed our projects on time while making cost-saving suggestions. I absolutely recommend KJN Builders as my contractor of choice.

We hired KJN Builders to build our wine cellar. They were the only contractor to listen to what we wanted. We were so impressed with the finished product we hired them again for our screen porch.

I have chosen to work with KJN Builders over and over again. Their dedication to doing the job right the first time and making sure the client is happy makes them a trusted partner. Each project has been on time and on budget and has surpassed our expectations.

I have worked with Jim Lewein and KJN Builders on many projects over the years. They bring extensive experience and a commitment to constructing buildings and spaces of the highest quality. Their professionalism and skill are why I recommend them to my clients.

We interviewed several contractors for our office and warehouse renovation and chose KJN for their reputation to complete on-time and on-budget. We had unique challenges and changes, and the team still met our functional requirements while satisfying all code reviews.

Jim, Nick and Jake are all conscientious individuals who want you to be happy with your project. Jim is a straight shooter who takes pride in his work and follows up on everything to ensure ultra satisfactory results.

Thank you KJN! Working with Nick and Jim on our home projects is great. The guidance, promptness, and thoroughness provided is appreciated. Our home is our sanctuary thanks to you!

Nick and his crew worked diligently on our kitchen remodeling project. Nick did an excellent job keeping us updated on each next step, including email schedules for who to expect and when. The quality of work was high, and the few minor issues were handled professionally and to our complete satisfaction. We highly recommend KJN and look forward to future projects.

I cannot imagine working with a group other than Jim and the entire team at KJN Builders. We remodeled an older building with many challenges, and not only was the finished product spectacular, but they also provided cost-effective ideas that aligned with our vision. I always felt connected and in the loop, and the work was done on schedule.

KJN Builders exceeded my expectations on our lease space office build-out. As a new business owner, I expected stress, but Jim and his family-run team made the process smooth and worry-free. Their communication and attention to detail were exceptional, and their professionalism made the entire experience enjoyable.

KJN Construction was fantastic to work with: fast, efficient, and affordable without sacrificing quality. Their subcontractors are top-notch, and the team is flexible and knowledgeable. They even stood up to dismissive insurance loss adjusters and fought for what was needed to make our property whole again.

KJN handled the full build-out of our new business in Delafield, and we are extremely pleased with the results. Jim and his team were professional, responsive, and easy to work with. The finished building turned out even better than we envisioned, and their quality shows in every part of the space.

Ixonia Bank has used KJN Builders for several branch projects over the years, and we have been very happy with their work. KJN's team is responsive and delivers on-time and on-budget. I would recommend them for any project, large or small.

I would recommend KJN for any construction project, big or small. They have supported multiple projects for me with unmatched responsiveness and accessibility. The team is skilled, resourceful, and can handle complicated projects while keeping communication efficient and clear.

I highly recommend Nick and his team at KJN Builders. Nick had excellent communication skills, was prompt and thorough, and his team was extremely friendly. They did an incredible job with our outdoor porch.